Calculator.



No. 774,281. PATENTED NOV. 8, 1904.

H. M. SEITZINGER.

CALCULATOR.

APPLICATION rum) MB. 27. 1904. F0 MODEL Z'SHEETS-SHBET 1.

"INBWWQNOOU- 6 W/T/VESSES INVENTOH,

2 SHEETS-SHEET 2.

PATENTED NOV.8, 1904.

CALCULATOR.

APPLIOATIO'N FILED FEB. 27, 1904.

H. M. SEITZIN GER.

N0 MODEL,

UNITED STATES v Patented November 8, 1904.

PATENT Orrin.

HARRY M. SEITZINGER, OF VVILKESBARRE, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO HAROLD .D. DEEMER, OF WILKESBARRE, PENN- SYLVANIA.

CALCULATOR- SPECIFICATION forming part of Letters Patent No. 774,281, dated November 8, 1904.

Application filed February 27, 190;i.' s1-a11t0. 195,643. (No model.)

To all whom, it may concern Be it known that I, HARRY M. SEITZINGER,-

a citizen of the United States, and a resident of VVilkesbarre, county of Luzerne, and State of Pennsylvania, have invented certainnewi and useful Improvements in Calculators, of

forming a part thereof, in which similar letters of reference indicate corresponding parts.

This invention relates to calculating-machines, the objects thereof being to provide a means for accurately indicating results and to produce such a machine which shall be simple in construction, positive in its action, and efficient in operation.

To these ends the invention consists principally of a screw-shaft' having an indicatingdisk and a spring-retracted two-part nut on said shaft to alternately rotate the shaft and be rotated thereon by reciprocating movement and in certain other combinations and details of construction hereinafter pointed out, and specifically set forth in the annexed claims.

In the accompanying drawings, forming part of this specification, Figure l is a plan view; Fig. 2, a sectional side elevation taken on line 2 2, Fig. 1; Fig. 3, a front end elevation; Fig. 4, Sheet 2, a sectional plan view taken on line4c 4, Fig. 2; Fig. 5, atransverse sectional elevation taken on line 5 5, Fig. 4; Fig. 6, a View similar to Fig. 5, but taken on line 6 6, Fig. 4; Fig. 7, an enlarged end view of one of the adding-shafts and its nut, being taken on the line 7 7, Fig. 2.

Referring to the accompanying drawings, A is a housing or frame in partitions ct (t of which are journaled the ends of horizontal parallel shafts b, b, 5 and 6 (there being in the present instance four of such shafts, although the number is immaterial, one such shaft being provided for each column of fig, ures to be added by the machine.) Each of the said shafts carries at its forward end, between the partition (0 and the end wall a of the frame, a ratchet-wheel 0. These ratchetwheels have ten teeth each, one for each of the ten digits, the digits being marked upon the face of the wheels opposite the respective teeth progressively from 1 to O in a direction opposite to that of the arrows in Fig. 5, which arrows indicate the direction of rotation of the said wheels and shafts, the wheels and shafts being prevented from rotation in the opposite direction by spring-pawls (Z, engaging the teeth thereof.

The shafts 6 Z), &c., are each provided with screw-threads, (preferably double threads, as seen in the drawings,) which threads are of opposite direction on adjacent shafts-that is, the threads of shafts b and b are of one direction (say right hand) and those of shafts 7) and b of the other direction, (left hand,) Moreover, said threads are of such pitch that a nut thereon when moved forward the length of the thread will rotate its shaft nine-tenths of a revolution, all for a purpose hereinafter with projections j, Fig. 2, which engage the I threads of the shaft, whereby when said inner sleeve is moved forward upon said shaft the latter will be rotated a corresponding extent.

The inner sleeve 2' is provided at one end with a flange 70, having peripheral ratchetteeth Z, that are engaged by a pawl m, carried by an upwardly-extending arm n of the outer sleeve 0 of the nut H. The upper end of the arm n extends through a slot 29 in the top of the frame A and has on its free end a knob or head r.

Projecting downwardly from the outer sleeve 0 of nut H is a tooth s, that is adapted when the nut is moved forward on its shaft to engage one of the teeth of a toothed rod T, which rod (there being one for each nut H) is pivoted at its forward end on a transverse shaft u.

The rod T is normally pressed upwardly against the tooth s by a spring o. Overlying said rods T is a bar w, adapted to be depressed in guideways 1, Figs. 4: and (3, by a presserbar ;I which extends upwardly through a l hole in the top of the housing and carries at l its free end a knob 1/.

In the front wall of the frame A are four alined holes 2, through which the figures on the ratchet-wheels 0 maybe seen, as shown in Fig. 3.

The operation of the device is as follows: Supposing that 0 be indicated at each of l the openings 2 and it is desired to add the sum 2,467 thereto, the operator grasps the 1 knob of the nut H which is upon shaft 7) and moves it forward until the tooth s engages the l seventh tooth of the bar T or until the arm a l comes opposite the figure 7, marked upon l the surface of the top of the frame A, adjal cent to the slot p, which indicates that shaft 5 l l l 7) has been rotated in the direction of the arrow in Fig. 5 seven-tenths of a complete revolution, thus bringing the figure 7 opposite the aperture; on the right-hand side of Fig. 3. The nut H on shaft 1) is next moved in similar manner until shaft 6 is rotated six-tenths of a revolution and the figure 6 appears opposite the aperture .2 in front of the ratchetwheel carried by shaft 6'. Nut H on shaft is next moved until the figure 4 appears at the next aperture 2 on the left and the nut on shaft 1) until figure 2 appears opposite the aperture 2 on the extreme left. Thus the result is indicated at the front of the frame A. Bar 20 is now depressed by pressing downwardly upon knob 1/, and thereby the teeth of bars T are. against the stress of the springs o, released from engagement from the teeth 8 of the nuts H, and the latter are retracted by the springs g to the normal position. Because of the ratchet-teeth Z and pawls 1/). connecting the inner sleeve and. the outer sleeve 0 of the nuts H when the latter are moved forward, as above described, the inner and outer sleeves will move as one nut, the inner sleeve being non-rotatably held to the outer sleeve; but when the nuts are retracted the inner sleeve will rotate in the outer sleeve upon the shaft, the pawl m disengaging from the ratchet teeth hen a number is to be added to the amount re- I corded at the apertures 2 in the front wall of the frame A, which number is such that it will be necessary to carry from one column to another, devices come into operation which I shall now proceed to describe, as follows: Projecting from the front face of each of the ratchet-wheels 0, except the one on the extreme left of Fig. 5, is a pin or stud c, that is in such position relative to the figures on the face of the ratchet-wheel that when the number opposite the aperture 2 changes from 9 to 0 said pin will engage a tooth of the next adjacent ratchet-wheel and rotate it the distance of one tooth, thus carrying one 1 to the result indicated on such ratchet-wheel. l In order that the said pins 0 may engage said teeth of the next adjacent wheel, I stagger the ratchet-wheels on the shafts, as seen in Figs. f and I remark that although it is very desirable I do not wish to be understood as limiting myself to the use of the nut having the tooth s and the corresponding toothed rod T and its correlated parts, as the same may be dispensed 5 with, nor do I wish to be understood as limiting myself to the use of the springs y, the important and essential feature being the shaft or series of shafts carrying the nuts H, said nuts being of such construction that when they are moved forward they will rotate the shafts in one direction to add, but when retracted will not rotate the shafts, but instead a portion of the nut will be rotated by the threads of the shaft, together with means op erated by said shafts for indicating the results.

Having now described my invention, what I claim as new, and. desire to secure by Letters Patent, is

1. In a calculator, the combination of a supporting-frame, a shaft journaled therein and provided with a screw-thread, means for preventing rotation of said shaft in one direction, a sleeve on said shaft engaging said thread, an outer sleeve within which the first-mentioned sleeve is adapted to rotate, together with the ratchet-and-pawl connection between said inner and outer sleeves, substantially as set forth.

2. In a calculator, the combination of a supporting-frame having a slot through the top wall thereof, a screw-threaded shaft below said slot, means for preventing rotation of said shaft in one direction, a sleeve on said shaft engaging said thread, an outer sleeve, ratchetand-pawl connections between said inner and outer sleeves, and an arm projecting upwardly from the outer sleeve through said slot in the frame, the pitch of the thread of said shaft being such that when the said arm, and sleeves are advanced from the rear to the forward end of said slot, the shaft will be thereby rotated nine-tenths of a revolution, substantially as set forth.

3. In a calculator, the combination of a supporting-frame, the series of parallel shafts journaled therein and provided with screwthreads, the threads of adjacent shafts being of opposite pitch, the sleeves on said shafts engaging said threads, the outer sleeves connected to said inner sleeves by ratchet-andpawl connection, means for preventing rotation of the outer sleeves yet permitting longitudinal movement thereof on said shafts, the ratchet-wheels on said shafts, the pawls engaging said ratchet-wheels, together with the carrying pins or studs projecting from the faces of said ratchet-wheels, substantially as set forth.

at. In a calculator, the combination of a supporting-frame, having a slot through the top wall thereof, a threaded shaft below said slot, a two-part nut carried by said shaft, said nut comprising an inner sleeve engaging the thread of said shaft and an outer sleeve connected to the inner sleeve by a ratchet-and-pawl connection, an arm projecting from the outer sleeve of saidnut through said slot in the frame, the tooth projecting from the said outer sleeve, the spring-supported toothed bar underlying said shaft whose teeth are adapted to be engaged by said tooth on the outer sleeve successively as the said nut is advanced on said shaft, together with means for disengaging the teeth of said bar from said tooth when desired, substantially as set forth.

5. In a calculator, the combination of a sup porting-frame, having a slot through the top wall thereof, a threaded shaft below said slot, means for preventing rotation of said shaft in one direction, a two-part nut carried by said shaft, said nut comprising an inner sleeve engaging the thread of said shaft and an outer sleeve connected to the inner sleeve by a ratchetand-pawl connection, an arm extending from said outer sleeve and projecting through said slot, a spring tending to normally maintain said nut adjacent to the rear of said shaft, the tooth on the under side of said nut, the spring-supported bar underlying said shaft and provided with nine teeth in its by said tooth of the nut as the latter is advanced along said shaft, said teeth of said bar being so spaced with relation to the thread on said shaft that a movement of the nut one tooth will rotate the shaft one-tenth of a revolution, together with means for disengaging said bar from the tooth of the nut when desired, substantially asset forth.

6. In a calculator, the combination with a screw-threaded shaft having an indicatingdisk on one end thereof, of a two-part springretracted sleeve for reciprocal and rotative movement on said shaft, and means for locking said sleeve in arbitrarily-selected positions on said shaft, substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed my name, in presence of two witnesses, this 10th day of February, 1904.

HARRY M. SEITZINGER. Witnesses:

B. PATTERSON, M. SHIPLEY.

, 3 upper edge, adapted to be successively engaged 

